Short: ResFind tries to activate best fitting language in Applications
[From the description file to resfind...]

What is ResFind?
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Acorn supports multilingual progamming by the MSGTRANS module. Quite a few
programmes use it for the messages of their programs. There are even several
(british) programs having messages in other languages than English (mainly
in German). Despite this I know of only one application (except those using
ResFind) adapting to the configured language automatically - Impression. For
the end user this can't be considered the way to go since he or she has to
do some work to activate the messages in the right language - even if the
language is supported. Here ResFind comes in. It tries to activate the
language fitting best. ResFind certainly isn't clairvoyant but on a
reasonably configured computer it should work just fine.